What we know so far
BBC are reporting (reliable ?) information now that rescuers are on site.
The aircraft is in 2 parts, there was a fire in the rear portion.
Rescuers are recovering bodies still strapped to their seats from the front portion.
The CVR and FDR have been recovered,
This implies a controlled forced landing which in turn implies a double engine failure. On the basis of this very limited information I woud be asking questions about the fuel supply.
Until the recorders are decoded everything is, of course, speculation and at this early stage the reports which we have are still suspect.